Stir together to blend, sour cream, egg yolk and vanilla extract. In a large bowl stir together flour and sugar. Cut in 3/4 cup butter or margarine until like coarse crumbs. Mix in sour cream mixture until well blended.
Divide dough in half and chill until easy to handle (3 hours or so).
To Make Filling: In small saucepan, melt the 1 tablespoon margarine. Add apples, raisins, brown sugar and spice and cook, stirring occasionally, until apples are fork tender. Remove excess liquid and cool.
Roll each piece of dough to about 1/8 inch thickness and cut with 2-1/2 inch round cookie cutter. Place rounds 1/2 inch apart on ungreased cookie sheet. Place (skimpy) teaspoon of filling on each round and fold in half. Seal edges with fork.
Bake at 350 degrees F (175 degrees C) for 10-12 minutes or until light brown. Remove and cool. Drizzle with lemon sugar icing made with 1/2 cup powdered sugar, 1 teaspoon lemon juice (fresh), 1 tablespoon water. Mix until of drizzling consistency. If too thick, add a little more water, if too thin, a little more confectioners' sugar.